Gwen Stefani spent Blake Shelton's birthday with him at his Hawaiian-themed estate, and she shared some private pictures of their fun time at the lavish digs.

Shelton turned 42 on Monday (June 18), and his superstar girlfriend turned to social media to share a handful of shots from inside the elaborate compound to Instagram Stories, including some outbuildings framed to resemble tiki huts, the pool and, most prominently, the flagpole, where the red, white and blue waves proudly in the wind.

The scene looks like it's straight out of Hawaii, but according to the U.K.'s Daily Mail, it's actually a lakefront property Shelton bought in his tiny hometown of Tishomingo, Okla., which the outlet says he had custom-built for Stefani. Photos of the estate under construction revealed palm trees planted liberally all around the grounds, which center around a main house built like a beach house, with a deck overlook and plenty of windows and doors to let in natural light and a nice view of Lake Texoma.

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The outbuildings all border a pool area that even features its own outside bar, also decked out in the style of a tiki hut, and the entire property is surrounded by a privacy fence to keep away prying eyes.

Stefani is set to launch her Las Vegas residency, Gwen Stefani: Just a Girl, at the Zappos Theater at Planet Hollywood Resort & Casino on June 27. She also used the time at the stunning home away from Los Angeles as a respite before she jumps back into a very busy schedule, writing, "Vegas right around the corner" on one of her IG shares.

Shelton has working ranch in Tishomingo, and he recently opened a satellite branch of his bar and music venue, Ole Red, in the Oklahoma town, where he and Stefani are often spotted patronizing small, local establishments like any other residents.